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(#) Looking for Rear Camera only feature

!!! WARNING: Looking for Rear Camera only feature
   This is a warning.

Id
:   `UnsupportedChromeOsCameraSystemFeature`
Summary
:   Looking for Rear Camera only feature
Severity
:   Warning
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   3.6.0 (February 2020)
Affects
:   Kotlin and Java files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/guide/topics/large-screens/large-screen-cookbook#chromebook_camera_support
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/ChromeOsSourceDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ChromeOsSourceDetectorTest.kt)

You should look for the `FEATURE_CAMERA_ANY` features to include all
possible cameras that may be on the device. Looking for `FEATURE_CAMERA`
only looks for a rear facing camera, which certain large screen devices
don't have, as well as newer device configurations and modes may place
the device in a state where the rear camera is not available. To fix the
issue, look for `FEATURE_CAMERA_ANY` instead.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
src/test/pkg/MainActivity.java:15:Warning: You should look for any
camera available on the device, not just the rear
[UnsupportedChromeOsCameraSystemFeature]
    getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA);
    -------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`src/test/pkg/MainActivity.java`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers
package test.pkg;

import android.app.Activity;

import android.content.pm.PackageManager;
import android.os.Bundle;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA);
    }
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ChromeOsSourceDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `ChromeOsSourceDetector.testInvalidCameraSystemFeature`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a suppression annotation like this on the enclosing
  element:

  ```kt
  // Kotlin
  @Suppress("UnsupportedChromeOsCameraSystemFeature")
  fun method() {
     setRequestedOrientation(...)
  }
  ```

  or

  ```java
  // Java
  @SuppressWarnings("UnsupportedChromeOsCameraSystemFeature")
  void method() {
     setRequestedOrientation(...);
  }
  ```

* Using a suppression comment like this on the line above:

  ```kt
  //noinspection UnsupportedChromeOsCameraSystemFeature
  problematicStatement()
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="UnsupportedChromeOsCameraSystemFeature" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'UnsupportedChromeOsCameraSystemFeature'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore UnsupportedChromeOsCameraSystemFeature ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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